You still need vapour barrier, and as long as the insulation stays away 10" and there is room for airflow to keep the pots cool, you should be fine. How big are you planning to make the boxes?

Toney in Winnipeg

4/19/2012 at 5:58:02 PM

This is in my basement, I shouldn't need a vapor barrier for that. And I was thinking on just the 3 1/2" pots with drywall boxes surrounding them. Which would be from joist to joist, and equal size all around... So, 10 1/2" x 10 1/2" x 7 1/2" (joists are 2x8).

I heard I would have to have an air space above the box with no insul.

You didn't mention your basement. You only require IC type boxes (IC = Insulated Ceiling) around insulation, non-IC or open frame are used around joists and no need for fire barrier.

Post a pic of what you are asking to put in as your question is not really clear.

Toney in Winnipeg

4/19/2012 at 9:25:52 PM

I don't have a picture to show, because it is only open, unfinished ceiling in my basement.

What I am trying to get across is that I am going to be installing pot lights into my joist cavities in my basement. I would like to insulate within the cavities so, unless I purchase non-IC pot lights, I would need a fire box. I want to know if I am allowed to use 5/8" Type X drywall instead of a metal fire box that can be purchased at any big box hardware store. My joists are spaced 12" apart and are made from 2x8 lumber. I would like to cut the drywall to fit within my joists and create a sealed box around each pot light. I would use fire caulking and metal tape. The dimensions of the box would be about 10 1/2" x 10 1/2" x 7 1/2".

Is this still acceptable to do? Or do I have to purchase the actual boxes or enclosures to hold the pot lights? I am talking about code and not personal preference. I have tried to contact electricians and the Permit/ Inspections department in my city, but no one can give me an answer.

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